How do I patch chips in my concrete retaining wall--cob, lime mortar, or something else?

We've been remodeling out garage to split it into a family room and a workshop. (Another thread about my garage, this time about the concrete floor.) The garage has a 3 foot high retaining wall, and part of the top of that retaining wall will be exposed even after the drywall is installed. But, it rather beat up, and has chunks and bits missing from the top. I would love to fill in the missing bits, and smooth it out...but with what???

I'm thinking of getting some lime mortar (maybe lime mortar from this limeworks.us) to fill the joint lines on the floor concrete. Could that also be used to fill in the missing bits in the retaining wall? Will concrete and lime mortar get along, even though concrete is hydrophilic?

Maybe a cob plaster (mostly clay and fine jute fibres and a bit of sand) would be better? Maybe mixing cob with lime mortar would work?

I honestly feel a bit out of my depth here. Anyone have any ideas or guidance?

Thanks!

Look up pour on concrete floor leveler and think temporary frame.

You could look up Masonry skim coat, and trowel it on with a small trowel if you want to go that route. When I built my first house, we did a 2x4 wall in front of the short concrete wall and drywalled it. Then above the drywall was just set back a little, so I had a little shelf to put things on and it was pretty nice.  Does that make sense?

They even put concrete patch in a caulk gun tube, but you would still need to trowel it out.